3M M2256PW manual 3M PX Serial Controller Communications, Overview of Firmware Commands

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3M™ Multi-touch Display M2256PW User Guide

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APPENDIX B

3M™ PX Serial Controller Communications

This appendix is intended for software developers only and discusses the fundamentals of communicating with the 3M™ PX serial controller. The firmware commands, which are usually issued by a driver or utility program on the host system, control the operation of the controller; however developers can enter these commands directly. This appendix:

•Describes the controller default settings.

•Lists the recommended firmware commands for current development.

•Describes how to use each of these commands.

•References additional commands developers may need to use.

The description of each command includes the command syntax, the default value, how the command works, and the expected response from the controller.

Overview of Firmware Commands

Developers may use these commands when writing touch applications, developing custom drivers or touch configurations, or testing their touch systems. Developers can issue commands to initialize the controller, select operating modes, and execute diagnostic functions.

Note: This document assumes you are familiar with standards and modes of communication with serial devices, as well as firmware commands and how to use them. Executing some commands may alter the performance of your sensor and render it inoperable. You should be aware of the results before executing any firmware commands.

To optimize the performance of the 3M™ PX controller and simplify the development of custom drivers, 3M Touch Systems recommends you use the commands listed in this appendix for current development.

3M Touch Systems, Inc. Proprietary Information – 37531 Rev D

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Contents 3M Touch Systems, Inc. Proprietary Information 37531 Rev D 3M Multi-touch Display M2256PW User Guide Contents Appendix C Regulatory Information Appendix a 3M PX USB Controller CommunicationsAppendix B 3M PX Serial Controller Communications Introduction Important Safety InformationOverview Intended UseExplanation of Signal Word Consequences Maintaining Your Touch Display Important Notes3M Touch Systems Support Services Touch Sensor Care and CleaningContact 3M Touch Systems System Requirements Setting up Your M2256PW Multi-touch DisplayCables Included with Your M2256PW Multi-touch Display Unpacking Your Touch DisplayArm Mounting Option Connecting the Touch DisplayTesting the M2256PW Multi-touch Display Applicable Display Mode and Refresh Rate Refresh Rate Hz Using the Standard Controls for the Video CardVideo Card Requirements Supported Video Display Modes and Refresh RatesMultimedia Features Configuring the Display SettingsAccess to the Video Controls Menu/Select Down Up Auto/Exit Power LEDChoices Description Adjusting the M2256PW Video DisplayAudio Tools Windows 7 USB Compatibility Enabling Your M2256PW Multi-touch DisplayAll Other Platforms Multitouch Application SupportVideo Alignment Installing 3M MicroTouch Software3M Multi-touch Display M2256PW User Guide Communication Basics 3M PX USB Controller CommunicationsOverview of USB Firmware Communications Set Feature Calibration Command SetReceiving Reports from the Controller HID Class RequestsCalibration Response Command Status Byte Description Calibration Setup Stage Offset Field Size Value DescriptionDetermining Target Areas Data Stage Offset Field Size Value DescriptionGet Feature GetStatus Power On Check Bit Fields Bit Number Description Get Feature GetMaxCountValid Command Status Field Entries Response Description Setup Stage Offset Field Size Value DescriptionReset Data Stage Offset Field Size Value Description Set Feature ResetReset Setup Stage Offset Field Size Value Description Coordinate Data MultiTouch Digitizer mode Async Report Set Feature -Restore DefaultsAsynchronous Reports Offset Field Size Value DescriptionValue Description Touch Report Structure Offset Field3M PX Serial Controller Communications Overview of Firmware CommandsOperating Mode Controller Default SettingsCommunicating with the Controller Communication ParametersReceiving Responses from the Controller Sending Commands to the ControllerController Initialization Firmware CommandsCalibrate Command Code DescriptionMDU SOH CxcrCalibrate Procedure Guidelines for Calibrate CommandMode Inactive Mode Down UpMode Stream Get CopyrightNull Command Name CommandSoft Reset Output IdentityOperating Parameter Default Restore DefaultsUnit Type SOH RdcrData Sequence Bits Touch Data FormatBit Description Data Sequence Bits FCC-B Regulatory InformationRegulatory Agency Approvals CE Conformity for Europe FCC Warning